1211208149 has 2 divisors, whose sum is σ = 1211208150. Its totient is φ = 1211208148.

The previous prime is 1211208139. The next prime is 1211208191. The reversal of 1211208149 is 9418021121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635544100 + 575664049 = 25210^2 + 23993^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211208149 - 2²⁸ = 942772693 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211208139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605604074 + 605604075.

It is an arithmetic number, because the mean of its divisors is an integer number (605604075).

Almost surely, 2^1211208149 is an apocalyptic number.

It is an amenable number.

1211208149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211208149 is an equidigital number, since it uses as much as digits as its factorization.

1211208149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1211208149 is about 34802.4158500527. The cubic root of 1211208149 is about 1065.9567761703.

The spelling of 1211208149 in words is "one billion, two hundred eleven million, two hundred eight thousand, one hundred forty-nine".